EP3293715B1 - Autonome ausrüstung zur bereichsüberwachung mithilfe eines passiven multizonen-infrarotsensors - Google Patents

Autonome ausrüstung zur bereichsüberwachung mithilfe eines passiven multizonen-infrarotsensors Download PDF

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EP3293715B1
EP3293715B1 EP17188171.7A EP17188171A EP3293715B1 EP 3293715 B1 EP3293715 B1 EP 3293715B1 EP 17188171 A EP17188171 A EP 17188171A EP 3293715 B1 EP3293715 B1 EP 3293715B1
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grid
square
target
detected
alert
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French (fr)
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EP3293715A1 (de
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Mehdi KHAIRY
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Freebox SAS
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Freebox SAS
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
    • G08B13/189—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems
    • G08B13/19—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength using passive radiation detection systems using infrared-radiation detection systems
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J2005/0077—Imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
    • G01J5/10—Radiation pyrometry, e.g. infrared or optical thermometry using electric radiation detectors
    • G01J2005/106—Arrays

Definitions

  • the invention relates to an autonomous zone monitoring equipment using a passive infrared-type sensor (PIR), which measures the IR light radiation produced by "hot objects” (heat sources interpreted as moving individuals). finding in his field of vision.
  • PIR passive infrared-type sensor
  • Sensors of this type are commonly used as presence detectors, an increase of the detected radiation being interpreted as a result of the appearance of a person in the field of view of the sensor, which makes it possible to control the lighting of a lighting , to deliver an intrusion alert signal, etc.
  • the field of view of the detector can be enlarged by optical means by associating a Fresnel lens or a reflector with the sensor, but in any case the covered area is globally monitored, undifferentiated.
  • intrusion detection systems can implement a tracking technique (tracking) hot objects at the local level. For this, it is necessary to equip each room of the room with a PIR detector and / or provide potential access to the outside (doors, windows) of perimeter sensors connected to an alarm center. Based on this information, the system analyzes the movements of the objects detected by the PIR sensors to extrapolate a movement from room to room, and to discriminate between internal displacements in the room (those of an authorized occupant or a warder moving from one room to another. room to another) and displacements of unknown origin, suggesting an intrusion.
  • tracking technique tracking hot objects at the local level. For this, it is necessary to equip each room of the room with a PIR detector and / or provide potential access to the outside (doors, windows) of perimeter sensors connected to an alarm center. Based on this information, the system analyzes the movements of the objects detected by the PIR sensors to extrapolate a movement from room to room, and to discriminate between internal displacements in the room (those of an authorized occupant or a
  • the US 2015/0347910 A1 describes a dwelling equipped with a multitude of detectors distributed in the space to be monitored, in order to finely analyze the movements of the people present in the dwelling.
  • the PIR sensors must be placed in such a way that the system can ensure that hot objects do not pass through a "shadow zone" when moving from one room to another. It can be a zone which is in the field of vision of any of the PIR detectors, or of a corridor or vestibule not equipped with a PIR detector. If the person crosses the shadow zone, it is impossible to know if the "hot object" detected in a room has appeared in this room coming from outside (intrusion by a window), or if it moves indoors, from an authorized area of the premises.
  • This disadvantage can be overcome by using no longer a simple PIR detector but an IR video camera coupled to an image processor programmed to perform on this image a tracking (video tracking ). But this technique involves a much higher cost than that of a simple PIR detector, with always the need to connect the camera to a central alarm for the consolidation of the various information and their analysis.
  • PIR detectors can be lured by fixed heat sources but emitting intermittently variable radiation, for example thermostatically controlled electric radiators: the engagement of the radiator causes a rapid rise in temperature thereof detectable by the PIR sensor, which will not discriminate between the entry of a mobile hot object in its field of vision, and the rise in temperature of a fixed cold object already present in this field of vision.
  • the present invention aims to solve all of these difficulties, by proposing an autonomous zone monitoring equipment using a passive infrared sensor capable of tracking hot objects (heat sources detected by the sensor) at the same time. scale of a room, and this in a completely autonomous way.
  • the basic idea of the invention lies in the use of a multi-zone PIR type PIR sensor, producing a two-dimensional image formed of a matrix (grid) of cells corresponding to adjacent elementary zones of the zone to be monitored, with for each box a respective signal of presence / absence of heat source at a given moment.
  • a heat source detected in the area to be monitored can be accurately tracked on a grid representative of the topography of the area to be monitored.
  • the precise tracking, according to the invention, of the hot object within the part will make it possible in particular to determine where the object appeared, and to discriminate between authorized origin (for example interior door) and suspicious origin (for example window).
  • authorized origin for example interior door
  • suspicious origin for example window
  • the multizone PIR sensor itself is concerned, it is a sensor in itself known, for example according to the US 7,728,297 B2 which describes an electronic component that can be used to make such a sensor.
  • thermographic image silica of an individual formed on the sensitive surface of the sensor.
  • US 2012/0038778 A1 and US 5,283,551A describe two devices of this type, operating a scanning, respectively 2D or 1D, of the thermographic image produced by the sensor.
  • the shape recognition algorithm makes it possible to discriminate the nature of the hot object that is to be detected according to its silhouette, but is not intended to follow the movements of this object.
  • the JP 2011-102670 A discloses equipment of this type, where the multizone PIR sensor produces a 2D image formed of a grid of elementary cells and where a processor analyzes this image to determine the presence or absence of a heat source in each box of the grid to emit an alarm if necessary.
  • reference numeral 10 designates an infrared sensor of the multizone type which is, as explained above in the introduction, a passive infrared-type sensor (PIR) comprising an optical system projecting on a 2D sensor an image of the area to be monitored ZS.
  • PIR passive infrared-type sensor
  • the 2D image thus formed is in the form of a matrix (grid) of i x j elementary sensor zones, each corresponding to an elementary zone Zij of the zone with ZS monitoring.
  • the sensor delivers a corresponding temperature signal for each elementary sensor zone, thus making it possible to detect the presence of a heat source specifically in each of the zones Zij of the zone to be monitored ZS.
  • a multizone PIR sensor is in itself known, for example according to the US 7,728,297 B2 above, and will not be described in more detail here.
  • AMG88 Panasonic Infrared Array Sensor Grid-EYE
  • This component delivers for each elementary zone a digital temperature signal of the corresponding elementary zone Zij with a refreshing frequency of once per second.
  • the assembly is in the form of a compact housing, which can be for example placed in the center of the room, the ceiling.
  • the reference 12 designates a circuit for processing and analyzing the data delivered by the sensor 10. This circuit may be disposed in a monobloc housing also incorporating the sensor 10, or placed at a distance therefrom.
  • the circuit 12 outputs an alert signal 14, which is an unauthorized target presence / absence signal (P / A), generally in the area to be monitored ZS, ie a single signal d alert for the entire area.
  • an alert signal 14 is an unauthorized target presence / absence signal (P / A), generally in the area to be monitored ZS, ie a single signal d alert for the entire area.
  • Each heat signal representative of a temperature in an elementary zone Zij, is compared with a threshold S to give an individual signal of presence / absence of target in each of these respective elementary areas Zij.
  • a set of data which can be represented as a matrix of ixj boxes Cij, each of these boxes being associated with an individual signal of presence / absence of a target in the corresponding elementary area Zij.
  • This indicator is a binary indicator indicating whether or not a heat source is present, depending on whether the temperature signal in the zone Zij is above or below the threshold S, respectively.
  • the data matrix delivered by the stage 16 is analyzed by a microcontroller 20, and the successive states of the matrix, at least the state preceding the current iteration, are stored in a data memory 22 so as to dispose of a history reflecting the possible movements, from one iteration to the next, of the heat source from one box to another in the area to be monitored.
  • the static grid G1 corresponds to a prior parameterization function of the particular topography of the zone to be monitored ZS.
  • This algorithm is executed iteratively, and triggered by an IT interrupt, which can be either a polling interrupt generated at regular intervals, or an interrupt triggered on a detected state change within the dynamic grid, ie that is, when it is detected that the state of a dynamic grid delivered by the sensor at the refreshing frequency differs from the previous state of this same dynamic grid.
  • an IT interrupt can be either a polling interrupt generated at regular intervals, or an interrupt triggered on a detected state change within the dynamic grid, ie that is, when it is detected that the state of a dynamic grid delivered by the sensor at the refreshing frequency differs from the previous state of this same dynamic grid.
  • the algorithm compares the grids G2 (stored prior state) and G3 (current state) and searches, for each box, if there has been modification of the presence / absence indicator of target . For the boxes whose indicator has changed from "absence” to "presence”, that is to say the boxes that have been changed to "hot box” since the last state, the algorithm examines, according to the parameterization of the static grid G1, if the box in question is in a secure zone, or in an authorized zone or crossing. If this box is in an allowed or traversed zone, then the corresponding flag in the G3 grid is set to "allowed box".
  • the same management algorithm by boxes adjacent is applied in order to detect whether, during the next iteration, there was or not movement of the box where the heat source had been detected, towards one of the adjacent squares. If yes, the alarm can be triggered; in the negative, it is a source of still heat, which does not reveal an intrusion.
  • the final step is to merge the two grids G2 and G3 by keeping the "hot” boxes of the grid G3 and positioning as “cold boxes” the cells of the grid G2 which were previously "hot” boxes, and which are become “cold”.
  • the implementation of the above algorithm presupposes the knowledge of an earlier state, to detect whether there has been movement of a hot source of an adjacent box between two successive iterations.
  • the algorithm analyzes the dynamic grid G3 delivered by the sensor and initializes in "box allowed "each box where a hot source has been detected, if this box is located inside the" crossing zone ", that is to say if the hot source corresponds to the presence of a target of which one is certain that it is an authorized user (since it comes for example from an internal communication door of the local, and is not an intruder).
  • the Figures 4 and 5 illustrate the results obtained by the implementation of the monitoring equipment of the invention, according to various scenarios of a user or intruder in the area to be monitored.
  • FIG. 1 there is shown a room (house, commercial premises, museum, etc.) comprising two areas to be monitored ZS1 and ZS2, each equipped with an autonomous monitoring equipment according to the invention such as that described with reference to the Figure 1 .
  • zones to be monitored ZS1 and ZS2 open in a corridor C, through respective inner doors P1 and P2.
  • the zones to be monitored ZS1 and ZS2 also include windows F1 and F2 respectively on the outside.
  • the detection of an entry in the zone ZS1 or ZS2 by the window F1 or F2 will be the fact of an intruder and will therefore trigger an alarm, while an entry via the inner doors P1 and P2 can be the fact that a normal user, and should not trigger an alarm.
  • the first scenario corresponding to the T1 path of the Figure 4 , is the one where the sensor detects the appearance of a heat source appearing on the zone ZT1 located next to the inner door P1, which zone is a crossing zone and therefore a permitted zone ,.
  • the detected source will be assigned in the dynamic grid of an indicator "allowed box", which will be kept during all the movements of a box in box in the room ZS1, even if the heat source passes in the secure zone ZS1, since the indicator "authorized box” has not been reset to zero during the movements of the path T1.
  • the second scenario is the one corresponding to the T2 trajectory of the Figure 4 : in this case, the sensor detects a moving heat source coming from a secure area ZX2, and without history of "allowed box" (previous state of the dynamic grid G2). It is therefore a prohibited route, revealing an intrusion, and the alarm must be triggered.
  • the third scenario corresponds to an inhabitant, who has been lying on a bed L and has fallen asleep. When it wakes up, the sensor detects a hot source displacement, but this should not trigger an intrusion alarm. Since there is a path history (initial path T3a entering the room and moving to the bed), the indicators of the boxes are initialized to "allowed box” and kept as is until waking. The trip T3b after awakening will include movements that will come from a box with an indicator "authorized box", which will not trigger an alarm even if the person is moving through the secure zone ZX1.
  • the Figure 5 also illustrates the case of a radiator R operating intermittently, located in the secure zone ZX1.
  • the temperature variations of this radiator will regularly generate heat source detections in this ZX1 secure zone, but in the absence of displacement of the detected heat source, no intrusion alarm will be produced (the equipment may be issue a notification signal corresponding to this situation, but without triggering an alarm).
  • the fourth scenario illustrated Figure 5 by routes T3c and T4, illustrates the possibility of leaving the surveillance equipment activated even in the presence of the inhabitants.
  • a heat source is detected in the secure zone ZX2, but can be related to an authorized history (corresponding for example to the path T3c of a resident coming from the corridor C) no alarm will be triggered.
  • an authorized history corresponding for example to the path T3c of a resident coming from the corridor C
  • This case (mobile source with / without history allowed) is useful especially for monitoring children's rooms, or for animals moving in a house.
  • intrusion detection in this scenario as in the others, does not in any way require the installation of perimeter detectors P1 and P2 interior doors, these perimeter detectors being replaced by the storage of a history of successive states of the dynamic grid delivered by the sensor.
  • the Figures 6a and 6b illustrate a refinement of the technique just described, for the detection of an anomaly in the number of people moving simultaneously within the boundaries of the area to be monitored.
  • the history of the successive states of the dynamic grid delivered by the sensor makes it possible, for a sufficiently long duration, to keep track of all the detected heat sources and their displacements, which makes it possible to extrapolate the number of sources (c 'ie people) simultaneously present in the area to be monitored.

Claims (5)

  1. Autonome Vorrichtung zur Zonenüberwachung, umfassend:
    - einen passiven Infrarot-Sensor (10), der in der Lage ist, in einem vorbestimmten Punkt in Sichtweite der zu überwachenden Zone (ZS) montiert zu werden, wobei dieser Sensor eine Signalsequenz für die im Inneren der zu überwachenden Zone detektierte Wärme ausgibt, wobei dieser Sensor ein Sensor des Mehrfachzonentyps ist, der ein zweidimensionales Bild erzeugt, das von einem Raster aus Feldern gebildet ist, die elementaren Zonen (Zij) entsprechen, die der zu überwachenden Zone (ZS) benachbart sind, mit einem jeweiligen Wärmesignal für jedes Feld;
    - Mittel (16) zur Analyse der Wärmesignale jedes Feldes des Rasters und zur Ausgabe, für jedes Signal der Sequenz und für jedes Feld des Rasters, eines Indikators für das Vorhandensein einer Wärmequelle, der für ein in dem entsprechenden Feld detektiertes Ziel repräsentativ ist; und
    - einen Datenprozessor (20), der in der Lage ist, die von dem Sensor ausgegebenen Signale zu analysieren, um zwischen dem Vorhandensein und Nichtvorhandensein einer Wärmequelle im Inneren der zu überwachenden Zone in Abhängigkeit von vorbestimmten Kriterien zu unterscheiden und, bei Vorhandensein eines in wenigstens einem Feld des Rasters detektierten Ziels, am Ausgang (14) bedingt einen Warnhinweis auszugeben,
    dadurch gekennzeichnet, dass:
    - die Felder des Rasters eingeteilt sind in autorisierte Felder und in gesicherte Felder; und
    - der Datenprozessor ausgestaltet ist für die bedingte Ausgabe des Warnhinweises bei Vorhandensein eines in wenigstens einem Feld des Rasters detektierten Ziels in Abhängigkeit von i) der Position des detektierten Ziels in dem Raster und ii) der Einteilung des Feldes, wo dieses Ziel detektiert wird, in autorisiertes Feld oder in gesichertes Feld.
  2. Autonome Vorrichtung nach Anspruch 1, wobei:
    - die Vorrichtung einen Datenspeicher (22) umfasst, der mit dem Prozessor per Schnittstelle verbunden ist und in der Lage ist, eine Historie der aufeinanderfolgenden Zustände der Indikatoren für das Vorhandensein einer Wärmequelle in dem Raster zu speichern; und
    - der Datenprozessor ferner so ausgestaltet ist, dass er Folgendes ausführt:
    * eine Verfolgung des detektierten Ziels durch Ausführen eines Nachbarfeld-Algorithmus mit Bestimmung des Pfades des verfolgten Ziels in dem Raster ausgehend von der Historie der aufeinanderfolgenden Zustände der Indikatoren für das Vorhandensein einer Wärmequelle in dem Raster; und
    * bedingte Ausgabe des Warnhinweises in Abhängigkeit von i) dem Pfad des verfolgten Ziels und ii) der Einteilung der nacheinander durch das Ziel auf diesem Pfad belegten Felder in autorisierte Felder oder in gesicherte Felder.
  3. Autonome Vorrichtung nach Anspruch 2, wobei der Datenprozessor so ausgestaltet ist, dass er den Warnhinweis bedingt ausgibt durch:
    * bei einem Ziel, das in einem gesicherten Feld erscheint, Analyse der Umgebung dieses Feldes um zu bestimmen, ob in dem vorherigen Zustand des Rasters, der in dem Speicher gespeichert ist, das Ziel detektiert wurde:
    - in einem gesicherten benachbarten Feld, mit in diesem Fall Ausgabe des Warnhinweises, oder
    - in einem autorisierten benachbarten Feld, mit in diesem Fall Fehlen der Ausgabe eines Warnhinweises.
  4. Autonome Vorrichtung nach Anspruch 2, wobei:
    - die Felder des Rasters eingeteilt sind in autorisierte Felder, in gesicherte Felder und in Durchgangsfelder; und
    - bei Fehlen eines früheren in dem Speicher gespeicherten Zustands, der Datenprozessor so ausgestaltet ist, dass er den Warnhinweis bedingt ausgibt durch:
    * Ausgabe des Warnhinweises, wenn das Ziel in einem gesicherten Feld detektiert wird, oder
    * Fehlen der Ausgabe eines Warnhinweises, wenn das Ziel in einem Durchgangsfeld detektiert wird.
  5. Autonome Vorrichtung nach Anspruch 2, wobeibei einer Mehrzahl detektierter Felder der Datenprozessor so ausgestaltet ist, dass er den Warnhinweis bedingt ausgibt durch:
    * für jeden der aufeinanderfolgenden Zustände der Indikatoren für das Vorhandensein einer Wärmequelle in dem Raster, Berechnen der Anzahl an detektierten Zielen, die in der zu überwachendem Zone gleichzeitig vorhanden sind; und
    * bei einem Ziel/bei Zielen, das die in einem gesicherten Feld erscheint/erscheinen und dann bei einem Übergang der aufeinanderfolgenden Zustände in ein autorisiertes Feld übergeht/übergehen, Ausgabe des Warnhinweises bei einer Änderung der Anzahl an Zielen, die vor und nach dem Übergang berechnet wurde.
EP17188171.7A 2016-09-01 2017-08-28 Autonome ausrüstung zur bereichsüberwachung mithilfe eines passiven multizonen-infrarotsensors Active EP3293715B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR1658140A FR3055455B1 (fr) 2016-09-01 2016-09-01 Equipement autonome de surveillance de zone par capteur infrarouge passif multizone

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US (1) US9972180B2 (de)
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FR3055455A1 (fr) 2018-03-02
US20180061198A1 (en) 2018-03-01
FR3055455B1 (fr) 2019-01-25
EP3293715A1 (de) 2018-03-14
ES2729502T3 (es) 2019-11-04
US9972180B2 (en) 2018-05-15

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